- Henry Percy, 1st Earl of Northumberland: He was a powerful nobleman and a key figure in the Wars of the Roses.
- Henry Percy, 5th Earl of Northumberland: He was a leading figure in the Pilgrimage of Grace, a rebellion against King Henry VIII.
- Algernon Percy, 10th Earl of Northumberland: He was a Royalist supporter during the English Civil War and defended Alnwick Castle against Parliamentarian forces.
- Hugh Percy, 1st Duke of Northumberland: He was a prominent statesman and served as Lord Lieutenant of Ireland and as First Lord of the Admiralty.
- Elizabeth Percy, Duchess of Northumberland: She was a noted socialite and a close friend of Queen Victoria.
- Alan Percy, 8th Duke of Northumberland: He was a distinguished soldier and served as Lord Lieutenant of Northumberland.
These are just a few examples of the many famous people who have lived at Alnwick Castle throughout its history.